1 | /* Copyright (C) 1993-2018 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | Written by Per Bothner <bothner@cygnus.com>. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. |
18 | |
19 | As a special exception, if you link the code in this file with |
20 | files compiled with a GNU compiler to produce an executable, |
21 | that does not cause the resulting executable to be covered by |
22 | the GNU Lesser General Public License. This exception does not |
23 | however invalidate any other reasons why the executable file |
24 | might be covered by the GNU Lesser General Public License. |
25 | This exception applies to code released by its copyright holders |
26 | in files containing the exception. */ |
27 | |
28 | /* This is a compatibility file. If we don't build the libc with |
29 | versioning don't compile this file. */ |
30 | #include <shlib-compat.h> |
31 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) |
32 | |
33 | #define _IO_USE_OLD_IO_FILE |
34 | #include "libioP.h" |
35 | #include <fcntl.h> |
36 | #include <sys/types.h> |
37 | #include <sys/stat.h> |
38 | #include <string.h> |
39 | #include <errno.h> |
40 | #include <stdlib.h> |
41 | #include <unistd.h> |
42 | |
43 | /* An fstream can be in at most one of put mode, get mode, or putback mode. |
44 | Putback mode is a variant of get mode. |
45 | |
46 | In a filebuf, there is only one current position, instead of two |
47 | separate get and put pointers. In get mode, the current position |
48 | is that of gptr(); in put mode that of pptr(). |
49 | |
50 | The position in the buffer that corresponds to the position |
51 | in external file system is normally _IO_read_end, except in putback |
52 | mode, when it is _IO_save_end. |
53 | If the field _fb._offset is >= 0, it gives the offset in |
54 | the file as a whole corresponding to eGptr(). (?) |
55 | |
56 | PUT MODE: |
57 | If a filebuf is in put mode, then all of _IO_read_ptr, _IO_read_end, |
58 | and _IO_read_base are equal to each other. These are usually equal |
59 | to _IO_buf_base, though not necessarily if we have switched from |
60 | get mode to put mode. (The reason is to maintain the invariant |
61 | that _IO_read_end corresponds to the external file position.) |
62 | _IO_write_base is non-NULL and usually equal to _IO_buf_base. |
63 | We also have _IO_write_end == _IO_buf_end, but only in fully buffered mode. |
64 | The un-flushed character are those between _IO_write_base and _IO_write_ptr. |
65 | |
66 | GET MODE: |
67 | If a filebuf is in get or putback mode, eback() != egptr(). |
68 | In get mode, the unread characters are between gptr() and egptr(). |
69 | The OS file position corresponds to that of egptr(). |
70 | |
71 | PUTBACK MODE: |
72 | Putback mode is used to remember "excess" characters that have |
73 | been sputbackc'd in a separate putback buffer. |
74 | In putback mode, the get buffer points to the special putback buffer. |
75 | The unread characters are the characters between gptr() and egptr() |
76 | in the putback buffer, as well as the area between save_gptr() |
77 | and save_egptr(), which point into the original reserve buffer. |
78 | (The pointers save_gptr() and save_egptr() are the values |
79 | of gptr() and egptr() at the time putback mode was entered.) |
80 | The OS position corresponds to that of save_egptr(). |
81 | |
82 | LINE BUFFERED OUTPUT: |
83 | During line buffered output, _IO_write_base==base() && epptr()==base(). |
84 | However, ptr() may be anywhere between base() and ebuf(). |
85 | This forces a call to filebuf::overflow(int C) on every put. |
86 | If there is more space in the buffer, and C is not a '\n', |
87 | then C is inserted, and pptr() incremented. |
88 | |
89 | UNBUFFERED STREAMS: |
90 | If a filebuf is unbuffered(), the _shortbuf[1] is used as the buffer. |
91 | */ |
92 | |
93 | #define CLOSED_FILEBUF_FLAGS \ |
94 | (_IO_IS_FILEBUF+_IO_NO_READS+_IO_NO_WRITES+_IO_TIED_PUT_GET) |
95 | |
96 | |
97 | void |
98 | attribute_compat_text_section |
99 | _IO_old_file_init_internal (struct _IO_FILE_plus *fp) |
100 | { |
101 | /* POSIX.1 allows another file handle to be used to change the position |
102 | of our file descriptor. Hence we actually don't know the actual |
103 | position before we do the first fseek (and until a following fflush). */ |
104 | fp->file._old_offset = _IO_pos_BAD; |
105 | fp->file._IO_file_flags |= CLOSED_FILEBUF_FLAGS; |
106 | |
107 | _IO_link_in (fp); |
108 | fp->file._vtable_offset = ((int) sizeof (struct _IO_FILE) |
109 | - (int) sizeof (struct _IO_FILE_complete)); |
110 | fp->file._fileno = -1; |
111 | |
112 | if (__builtin_expect (&_IO_stdin_used != NULL, 1) |
113 | || (fp != (struct _IO_FILE_plus *) _IO_stdin |
114 | && fp != (struct _IO_FILE_plus *) _IO_stdout |
115 | && fp != (struct _IO_FILE_plus *) _IO_stderr)) |
116 | /* The object is dynamically allocated and large enough. Initialize |
117 | the _mode element as well. */ |
118 | ((struct _IO_FILE_complete *) fp)->_mode = -1; |
119 | } |
120 | |
121 | void |
122 | attribute_compat_text_section |
123 | _IO_old_file_init (struct _IO_FILE_plus *fp) |
124 | { |
125 | IO_set_accept_foreign_vtables (&_IO_vtable_check); |
126 | _IO_old_file_init_internal (fp); |
127 | } |
128 | |
129 | int |
130 | attribute_compat_text_section |
131 | _IO_old_file_close_it (_IO_FILE *fp) |
132 | { |
133 | int write_status, close_status; |
134 | if (!_IO_file_is_open (fp)) |
135 | return EOF; |
136 | |
137 | write_status = _IO_old_do_flush (fp); |
138 | |
139 | _IO_unsave_markers (fp); |
140 | |
141 | close_status = ((fp->_flags2 & _IO_FLAGS2_NOCLOSE) == 0 |
142 | ? _IO_SYSCLOSE (fp) : 0); |
143 | |
144 | /* Free buffer. */ |
145 | _IO_setb (fp, NULL, NULL, 0); |
146 | _IO_setg (fp, NULL, NULL, NULL); |
147 | _IO_setp (fp, NULL, NULL); |
148 | |
149 | _IO_un_link ((struct _IO_FILE_plus *) fp); |
150 | fp->_flags = _IO_MAGIC|CLOSED_FILEBUF_FLAGS; |
151 | fp->_fileno = -1; |
152 | fp->_old_offset = _IO_pos_BAD; |
153 | |
154 | return close_status ? close_status : write_status; |
155 | } |
156 | |
157 | void |
158 | attribute_compat_text_section |
159 | _IO_old_file_finish (_IO_FILE *fp, int dummy) |
160 | { |
161 | if (_IO_file_is_open (fp)) |
162 | { |
163 | _IO_old_do_flush (fp); |
164 | if (!(fp->_flags & _IO_DELETE_DONT_CLOSE)) |
165 | _IO_SYSCLOSE (fp); |
166 | } |
167 | _IO_default_finish (fp, 0); |
168 | } |
169 | |
170 | _IO_FILE * |
171 | attribute_compat_text_section |
172 | _IO_old_file_fopen (_IO_FILE *fp, const char *filename, const char *mode) |
173 | { |
174 | int oflags = 0, omode; |
175 | int read_write, fdesc; |
176 | int oprot = 0666; |
177 | if (_IO_file_is_open (fp)) |
178 | return 0; |
179 | switch (*mode++) |
180 | { |
181 | case 'r': |
182 | omode = O_RDONLY; |
183 | read_write = _IO_NO_WRITES; |
184 | break; |
185 | case 'w': |
186 | omode = O_WRONLY; |
187 | oflags = O_CREAT|O_TRUNC; |
188 | read_write = _IO_NO_READS; |
189 | break; |
190 | case 'a': |
191 | omode = O_WRONLY; |
192 | oflags = O_CREAT|O_APPEND; |
193 | read_write = _IO_NO_READS|_IO_IS_APPENDING; |
194 | break; |
195 | default: |
196 | __set_errno (EINVAL); |
197 | return NULL; |
198 | } |
199 | if (mode[0] == '+' || (mode[0] == 'b' && mode[1] == '+')) |
200 | { |
201 | omode = O_RDWR; |
202 | read_write &= _IO_IS_APPENDING; |
203 | } |
204 | fdesc = __open (filename, omode|oflags, oprot); |
205 | if (fdesc < 0) |
206 | return NULL; |
207 | fp->_fileno = fdesc; |
208 | _IO_mask_flags (fp, read_write,_IO_NO_READS+_IO_NO_WRITES+_IO_IS_APPENDING); |
209 | if (read_write & _IO_IS_APPENDING) |
210 | if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_end, _IOS_INPUT|_IOS_OUTPUT) |
211 | == _IO_pos_BAD && errno != ESPIPE) |
212 | return NULL; |
213 | _IO_link_in ((struct _IO_FILE_plus *) fp); |
214 | return fp; |
215 | } |
216 | |
217 | _IO_FILE * |
218 | attribute_compat_text_section |
219 | _IO_old_file_attach (_IO_FILE *fp, int fd) |
220 | { |
221 | if (_IO_file_is_open (fp)) |
222 | return NULL; |
223 | fp->_fileno = fd; |
224 | fp->_flags &= ~(_IO_NO_READS+_IO_NO_WRITES); |
225 | fp->_flags |= _IO_DELETE_DONT_CLOSE; |
226 | /* Get the current position of the file. */ |
227 | /* We have to do that since that may be junk. */ |
228 | fp->_old_offset = _IO_pos_BAD; |
229 | if (_IO_SEEKOFF (fp, (_IO_off_t)0, _IO_seek_cur, _IOS_INPUT|_IOS_OUTPUT) |
230 | == _IO_pos_BAD && errno != ESPIPE) |
231 | return NULL; |
232 | return fp; |
233 | } |
234 | |
235 | _IO_FILE * |
236 | attribute_compat_text_section |
237 | _IO_old_file_setbuf (_IO_FILE *fp, char *p, _IO_ssize_t len) |
238 | { |
239 | if (_IO_default_setbuf (fp, p, len) == NULL) |
240 | return NULL; |
241 | |
242 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
243 | = fp->_IO_buf_base; |
244 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
245 | |
246 | return fp; |
247 | } |
248 | |
249 | static int old_do_write (_IO_FILE *, const char *, _IO_size_t); |
250 | |
251 | /* Write TO_DO bytes from DATA to FP. |
252 | Then mark FP as having empty buffers. */ |
253 | |
254 | int |
255 | attribute_compat_text_section |
256 | _IO_old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
257 | { |
258 | return (to_do == 0 || (_IO_size_t) old_do_write (fp, data, to_do) == to_do) |
259 | ? 0 : EOF; |
260 | } |
261 | |
262 | static int |
263 | attribute_compat_text_section |
264 | old_do_write (_IO_FILE *fp, const char *data, _IO_size_t to_do) |
265 | { |
266 | _IO_size_t count; |
267 | if (fp->_flags & _IO_IS_APPENDING) |
268 | /* On a system without a proper O_APPEND implementation, |
269 | you would need to sys_seek(0, SEEK_END) here, but is |
270 | not needed nor desirable for Unix- or Posix-like systems. |
271 | Instead, just indicate that offset (before and after) is |
272 | unpredictable. */ |
273 | fp->_old_offset = _IO_pos_BAD; |
274 | else if (fp->_IO_read_end != fp->_IO_write_base) |
275 | { |
276 | _IO_off_t new_pos |
277 | = _IO_SYSSEEK (fp, fp->_IO_write_base - fp->_IO_read_end, 1); |
278 | if (new_pos == _IO_pos_BAD) |
279 | return 0; |
280 | fp->_old_offset = new_pos; |
281 | } |
282 | count = _IO_SYSWRITE (fp, data, to_do); |
283 | if (fp->_cur_column && count) |
284 | fp->_cur_column = _IO_adjust_column (fp->_cur_column - 1, data, count) + 1; |
285 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
286 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_buf_base; |
287 | fp->_IO_write_end = ((fp->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
288 | ? fp->_IO_buf_base : fp->_IO_buf_end); |
289 | return count; |
290 | } |
291 | |
292 | int |
293 | attribute_compat_text_section |
294 | _IO_old_file_underflow (_IO_FILE *fp) |
295 | { |
296 | _IO_ssize_t count; |
297 | #if 0 |
298 | /* SysV does not make this test; take it out for compatibility */ |
299 | if (fp->_flags & _IO_EOF_SEEN) |
300 | return (EOF); |
301 | #endif |
302 | |
303 | if (fp->_flags & _IO_NO_READS) |
304 | { |
305 | fp->_flags |= _IO_ERR_SEEN; |
306 | __set_errno (EBADF); |
307 | return EOF; |
308 | } |
309 | if (fp->_IO_read_ptr < fp->_IO_read_end) |
310 | return *(unsigned char *) fp->_IO_read_ptr; |
311 | |
312 | if (fp->_IO_buf_base == NULL) |
313 | { |
314 | /* Maybe we already have a push back pointer. */ |
315 | if (fp->_IO_save_base != NULL) |
316 | { |
317 | free (fp->_IO_save_base); |
318 | fp->_flags &= ~_IO_IN_BACKUP; |
319 | } |
320 | _IO_doallocbuf (fp); |
321 | } |
322 | |
323 | /* Flush all line buffered files before reading. */ |
324 | /* FIXME This can/should be moved to genops ?? */ |
325 | if (fp->_flags & (_IO_LINE_BUF|_IO_UNBUFFERED)) |
326 | _IO_flush_all_linebuffered (); |
327 | |
328 | _IO_switch_to_get_mode (fp); |
329 | |
330 | /* This is very tricky. We have to adjust those |
331 | pointers before we call _IO_SYSREAD () since |
332 | we may longjump () out while waiting for |
333 | input. Those pointers may be screwed up. H.J. */ |
334 | fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_buf_base; |
335 | fp->_IO_read_end = fp->_IO_buf_base; |
336 | fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end |
337 | = fp->_IO_buf_base; |
338 | |
339 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
340 | fp->_IO_buf_end - fp->_IO_buf_base); |
341 | if (count <= 0) |
342 | { |
343 | if (count == 0) |
344 | fp->_flags |= _IO_EOF_SEEN; |
345 | else |
346 | fp->_flags |= _IO_ERR_SEEN, count = 0; |
347 | } |
348 | fp->_IO_read_end += count; |
349 | if (count == 0) |
350 | return EOF; |
351 | if (fp->_old_offset != _IO_pos_BAD) |
352 | _IO_pos_adjust (fp->_old_offset, count); |
353 | return *(unsigned char *) fp->_IO_read_ptr; |
354 | } |
355 | |
356 | int |
357 | attribute_compat_text_section |
358 | _IO_old_file_overflow (_IO_FILE *f, int ch) |
359 | { |
360 | if (f->_flags & _IO_NO_WRITES) /* SET ERROR */ |
361 | { |
362 | f->_flags |= _IO_ERR_SEEN; |
363 | __set_errno (EBADF); |
364 | return EOF; |
365 | } |
366 | /* If currently reading or no buffer allocated. */ |
367 | if ((f->_flags & _IO_CURRENTLY_PUTTING) == 0) |
368 | { |
369 | /* Allocate a buffer if needed. */ |
370 | if (f->_IO_write_base == 0) |
371 | { |
372 | _IO_doallocbuf (f); |
373 | _IO_setg (f, f->_IO_buf_base, f->_IO_buf_base, f->_IO_buf_base); |
374 | } |
375 | /* Otherwise must be currently reading. |
376 | If _IO_read_ptr (and hence also _IO_read_end) is at the buffer end, |
377 | logically slide the buffer forwards one block (by setting the |
378 | read pointers to all point at the beginning of the block). This |
379 | makes room for subsequent output. |
380 | Otherwise, set the read pointers to _IO_read_end (leaving that |
381 | alone, so it can continue to correspond to the external position). */ |
382 | if (f->_IO_read_ptr == f->_IO_buf_end) |
383 | f->_IO_read_end = f->_IO_read_ptr = f->_IO_buf_base; |
384 | f->_IO_write_ptr = f->_IO_read_ptr; |
385 | f->_IO_write_base = f->_IO_write_ptr; |
386 | f->_IO_write_end = f->_IO_buf_end; |
387 | f->_IO_read_base = f->_IO_read_ptr = f->_IO_read_end; |
388 | |
389 | if (f->_flags & (_IO_LINE_BUF | _IO_UNBUFFERED)) |
390 | f->_IO_write_end = f->_IO_write_ptr; |
391 | f->_flags |= _IO_CURRENTLY_PUTTING; |
392 | } |
393 | if (ch == EOF) |
394 | return _IO_old_do_flush (f); |
395 | if (f->_IO_write_ptr == f->_IO_buf_end ) /* Buffer is really full */ |
396 | if (_IO_old_do_flush (f) == EOF) |
397 | return EOF; |
398 | *f->_IO_write_ptr++ = ch; |
399 | if ((f->_flags & _IO_UNBUFFERED) |
400 | || ((f->_flags & _IO_LINE_BUF) && ch == '\n')) |
401 | if (_IO_old_do_flush (f) == EOF) |
402 | return EOF; |
403 | return (unsigned char) ch; |
404 | } |
405 | |
406 | int |
407 | attribute_compat_text_section |
408 | _IO_old_file_sync (_IO_FILE *fp) |
409 | { |
410 | _IO_ssize_t delta; |
411 | int retval = 0; |
412 | |
413 | /* char* ptr = cur_ptr(); */ |
414 | if (fp->_IO_write_ptr > fp->_IO_write_base) |
415 | if (_IO_old_do_flush(fp)) return EOF; |
416 | delta = fp->_IO_read_ptr - fp->_IO_read_end; |
417 | if (delta != 0) |
418 | { |
419 | #ifdef TODO |
420 | if (_IO_in_backup (fp)) |
421 | delta -= eGptr () - Gbase (); |
422 | #endif |
423 | _IO_off_t new_pos = _IO_SYSSEEK (fp, delta, 1); |
424 | if (new_pos != (_IO_off_t) EOF) |
425 | fp->_IO_read_end = fp->_IO_read_ptr; |
426 | else if (errno == ESPIPE) |
427 | ; /* Ignore error from unseekable devices. */ |
428 | else |
429 | retval = EOF; |
430 | } |
431 | if (retval != EOF) |
432 | fp->_old_offset = _IO_pos_BAD; |
433 | /* FIXME: Cleanup - can this be shared? */ |
434 | /* setg(base(), ptr, ptr); */ |
435 | return retval; |
436 | } |
437 | |
438 | _IO_off64_t |
439 | attribute_compat_text_section |
440 | _IO_old_file_seekoff (_IO_FILE *fp, _IO_off64_t offset, int dir, int mode) |
441 | { |
442 | _IO_off_t result; |
443 | _IO_off64_t delta, new_offset; |
444 | long count; |
445 | /* POSIX.1 8.2.3.7 says that after a call the fflush() the file |
446 | offset of the underlying file must be exact. */ |
447 | int must_be_exact = (fp->_IO_read_base == fp->_IO_read_end |
448 | && fp->_IO_write_base == fp->_IO_write_ptr); |
449 | |
450 | if (mode == 0) |
451 | dir = _IO_seek_cur, offset = 0; /* Don't move any pointers. */ |
452 | |
453 | /* Flush unwritten characters. |
454 | (This may do an unneeded write if we seek within the buffer. |
455 | But to be able to switch to reading, we would need to set |
456 | egptr to pptr. That can't be done in the current design, |
457 | which assumes file_ptr() is eGptr. Anyway, since we probably |
458 | end up flushing when we close(), it doesn't make much difference.) |
459 | FIXME: simulate mem-mapped files. */ |
460 | |
461 | if (fp->_IO_write_ptr > fp->_IO_write_base || _IO_in_put_mode (fp)) |
462 | if (_IO_switch_to_get_mode (fp)) |
463 | return EOF; |
464 | |
465 | if (fp->_IO_buf_base == NULL) |
466 | { |
467 | /* It could be that we already have a pushback buffer. */ |
468 | if (fp->_IO_read_base != NULL) |
469 | { |
470 | free (fp->_IO_read_base); |
471 | fp->_flags &= ~_IO_IN_BACKUP; |
472 | } |
473 | _IO_doallocbuf (fp); |
474 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
475 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
476 | } |
477 | |
478 | switch (dir) |
479 | { |
480 | case _IO_seek_cur: |
481 | /* Adjust for read-ahead (bytes is buffer). */ |
482 | offset -= fp->_IO_read_end - fp->_IO_read_ptr; |
483 | if (fp->_old_offset == _IO_pos_BAD) |
484 | goto dumb; |
485 | /* Make offset absolute, assuming current pointer is file_ptr(). */ |
486 | offset += fp->_old_offset; |
487 | |
488 | dir = _IO_seek_set; |
489 | break; |
490 | case _IO_seek_set: |
491 | break; |
492 | case _IO_seek_end: |
493 | { |
494 | struct stat64 st; |
495 | if (_IO_SYSSTAT (fp, &st) == 0 && S_ISREG (st.st_mode)) |
496 | { |
497 | offset += st.st_size; |
498 | dir = _IO_seek_set; |
499 | } |
500 | else |
501 | goto dumb; |
502 | } |
503 | } |
504 | /* At this point, dir==_IO_seek_set. */ |
505 | |
506 | /* If we are only interested in the current position we've found it now. */ |
507 | if (mode == 0) |
508 | return offset; |
509 | |
510 | /* If destination is within current buffer, optimize: */ |
511 | if (fp->_old_offset != _IO_pos_BAD && fp->_IO_read_base != NULL |
512 | && !_IO_in_backup (fp)) |
513 | { |
514 | /* Offset relative to start of main get area. */ |
515 | _IO_off_t rel_offset = (offset - fp->_old_offset |
516 | + (fp->_IO_read_end - fp->_IO_read_base)); |
517 | if (rel_offset >= 0) |
518 | { |
519 | #if 0 |
520 | if (_IO_in_backup (fp)) |
521 | _IO_switch_to_main_get_area (fp); |
522 | #endif |
523 | if (rel_offset <= fp->_IO_read_end - fp->_IO_read_base) |
524 | { |
525 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + rel_offset, |
526 | fp->_IO_read_end); |
527 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
528 | { |
529 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
530 | goto resync; |
531 | } |
532 | } |
533 | #ifdef TODO |
534 | /* If we have streammarkers, seek forward by reading ahead. */ |
535 | if (_IO_have_markers (fp)) |
536 | { |
537 | int to_skip = rel_offset |
538 | - (fp->_IO_read_ptr - fp->_IO_read_base); |
539 | if (ignore (to_skip) != to_skip) |
540 | goto dumb; |
541 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
542 | goto resync; |
543 | } |
544 | #endif |
545 | } |
546 | #ifdef TODO |
547 | if (rel_offset < 0 && rel_offset >= Bbase () - Bptr ()) |
548 | { |
549 | if (!_IO_in_backup (fp)) |
550 | _IO_switch_to_backup_area (fp); |
551 | gbump (fp->_IO_read_end + rel_offset - fp->_IO_read_ptr); |
552 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
553 | goto resync; |
554 | } |
555 | #endif |
556 | } |
557 | |
558 | #ifdef TODO |
559 | _IO_unsave_markers (fp); |
560 | #endif |
561 | |
562 | if (fp->_flags & _IO_NO_READS) |
563 | goto dumb; |
564 | |
565 | /* Try to seek to a block boundary, to improve kernel page management. */ |
566 | new_offset = offset & ~(fp->_IO_buf_end - fp->_IO_buf_base - 1); |
567 | delta = offset - new_offset; |
568 | if (delta > fp->_IO_buf_end - fp->_IO_buf_base) |
569 | { |
570 | new_offset = offset; |
571 | delta = 0; |
572 | } |
573 | result = _IO_SYSSEEK (fp, new_offset, 0); |
574 | if (result < 0) |
575 | return EOF; |
576 | if (delta == 0) |
577 | count = 0; |
578 | else |
579 | { |
580 | count = _IO_SYSREAD (fp, fp->_IO_buf_base, |
581 | (must_be_exact |
582 | ? delta : fp->_IO_buf_end - fp->_IO_buf_base)); |
583 | if (count < delta) |
584 | { |
585 | /* We weren't allowed to read, but try to seek the remainder. */ |
586 | offset = count == EOF ? delta : delta-count; |
587 | dir = _IO_seek_cur; |
588 | goto dumb; |
589 | } |
590 | } |
591 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base + delta, |
592 | fp->_IO_buf_base + count); |
593 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
594 | fp->_old_offset = result + count; |
595 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
596 | return offset; |
597 | dumb: |
598 | |
599 | _IO_unsave_markers (fp); |
600 | result = _IO_SYSSEEK (fp, offset, dir); |
601 | if (result != EOF) |
602 | { |
603 | _IO_mask_flags (fp, 0, _IO_EOF_SEEN); |
604 | fp->_old_offset = result; |
605 | _IO_setg (fp, fp->_IO_buf_base, fp->_IO_buf_base, fp->_IO_buf_base); |
606 | _IO_setp (fp, fp->_IO_buf_base, fp->_IO_buf_base); |
607 | } |
608 | return result; |
609 | |
610 | resync: |
611 | /* We need to do it since it is possible that the file offset in |
612 | the kernel may be changed behind our back. It may happen when |
613 | we fopen a file and then do a fork. One process may access the |
614 | file and the kernel file offset will be changed. */ |
615 | if (fp->_old_offset >= 0) |
616 | _IO_SYSSEEK (fp, fp->_old_offset, 0); |
617 | |
618 | return offset; |
619 | } |
620 | |
621 | _IO_ssize_t |
622 | attribute_compat_text_section |
623 | _IO_old_file_write (_IO_FILE *f, const void *data, _IO_ssize_t n) |
624 | { |
625 | _IO_ssize_t to_do = n; |
626 | while (to_do > 0) |
627 | { |
628 | _IO_ssize_t count = __write (f->_fileno, data, to_do); |
629 | if (count == EOF) |
630 | { |
631 | f->_flags |= _IO_ERR_SEEN; |
632 | break; |
633 | } |
634 | to_do -= count; |
635 | data = (void *) ((char *) data + count); |
636 | } |
637 | n -= to_do; |
638 | if (f->_old_offset >= 0) |
639 | f->_old_offset += n; |
640 | return n; |
641 | } |
642 | |
643 | _IO_size_t |
644 | attribute_compat_text_section |
645 | _IO_old_file_xsputn (_IO_FILE *f, const void *data, _IO_size_t n) |
646 | { |
647 | const char *s = (char *) data; |
648 | _IO_size_t to_do = n; |
649 | int must_flush = 0; |
650 | _IO_size_t count = 0; |
651 | |
652 | if (n <= 0) |
653 | return 0; |
654 | /* This is an optimized implementation. |
655 | If the amount to be written straddles a block boundary |
656 | (or the filebuf is unbuffered), use sys_write directly. */ |
657 | |
658 | /* First figure out how much space is available in the buffer. */ |
659 | if ((f->_flags & _IO_LINE_BUF) && (f->_flags & _IO_CURRENTLY_PUTTING)) |
660 | { |
661 | count = f->_IO_buf_end - f->_IO_write_ptr; |
662 | if (count >= n) |
663 | { |
664 | const char *p; |
665 | for (p = s + n; p > s; ) |
666 | { |
667 | if (*--p == '\n') |
668 | { |
669 | count = p - s + 1; |
670 | must_flush = 1; |
671 | break; |
672 | } |
673 | } |
674 | } |
675 | } |
676 | else if (f->_IO_write_end > f->_IO_write_ptr) |
677 | count = f->_IO_write_end - f->_IO_write_ptr; /* Space available. */ |
678 | |
679 | /* Then fill the buffer. */ |
680 | if (count > 0) |
681 | { |
682 | if (count > to_do) |
683 | count = to_do; |
684 | if (count > 20) |
685 | { |
686 | f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count); |
687 | s += count; |
688 | } |
689 | else |
690 | { |
691 | char *p = f->_IO_write_ptr; |
692 | int i = (int) count; |
693 | while (--i >= 0) |
694 | *p++ = *s++; |
695 | f->_IO_write_ptr = p; |
696 | } |
697 | to_do -= count; |
698 | } |
699 | if (to_do + must_flush > 0) |
700 | { |
701 | _IO_size_t block_size, do_write; |
702 | /* Next flush the (full) buffer. */ |
703 | if (__overflow (f, EOF) == EOF) |
704 | return to_do == 0 ? EOF : n - to_do; |
705 | |
706 | /* Try to maintain alignment: write a whole number of blocks. |
707 | dont_write is what gets left over. */ |
708 | block_size = f->_IO_buf_end - f->_IO_buf_base; |
709 | do_write = to_do - (block_size >= 128 ? to_do % block_size : 0); |
710 | |
711 | if (do_write) |
712 | { |
713 | count = old_do_write (f, s, do_write); |
714 | to_do -= count; |
715 | if (count < do_write) |
716 | return n - to_do; |
717 | } |
718 | |
719 | /* Now write out the remainder. Normally, this will fit in the |
720 | buffer, but it's somewhat messier for line-buffered files, |
721 | so we let _IO_default_xsputn handle the general case. */ |
722 | if (to_do) |
723 | to_do -= _IO_default_xsputn (f, s+do_write, to_do); |
724 | } |
725 | return n - to_do; |
726 | } |
727 | |
728 | |
729 | const struct _IO_jump_t _IO_old_file_jumps libio_vtable = |
730 | { |
731 | JUMP_INIT_DUMMY, |
732 | JUMP_INIT(finish, _IO_old_file_finish), |
733 | JUMP_INIT(overflow, _IO_old_file_overflow), |
734 | JUMP_INIT(underflow, _IO_old_file_underflow), |
735 | JUMP_INIT(uflow, _IO_default_uflow), |
736 | JUMP_INIT(pbackfail, _IO_default_pbackfail), |
737 | JUMP_INIT(xsputn, _IO_old_file_xsputn), |
738 | JUMP_INIT(xsgetn, _IO_default_xsgetn), |
739 | JUMP_INIT(seekoff, _IO_old_file_seekoff), |
740 | JUMP_INIT(seekpos, _IO_default_seekpos), |
741 | JUMP_INIT(setbuf, _IO_old_file_setbuf), |
742 | JUMP_INIT(sync, _IO_old_file_sync), |
743 | JUMP_INIT(doallocate, _IO_file_doallocate), |
744 | JUMP_INIT(read, _IO_file_read), |
745 | JUMP_INIT(write, _IO_old_file_write), |
746 | JUMP_INIT(seek, _IO_file_seek), |
747 | JUMP_INIT(close, _IO_file_close), |
748 | JUMP_INIT(stat, _IO_file_stat) |
749 | }; |
750 | |
751 | compat_symbol (libc, _IO_old_do_write, _IO_do_write, GLIBC_2_0); |
752 | compat_symbol (libc, _IO_old_file_attach, _IO_file_attach, GLIBC_2_0); |
753 | compat_symbol (libc, _IO_old_file_close_it, _IO_file_close_it, GLIBC_2_0); |
754 | compat_symbol (libc, _IO_old_file_finish, _IO_file_finish, GLIBC_2_0); |
755 | compat_symbol (libc, _IO_old_file_fopen, _IO_file_fopen, GLIBC_2_0); |
756 | compat_symbol (libc, _IO_old_file_init, _IO_file_init, GLIBC_2_0); |
757 | compat_symbol (libc, _IO_old_file_setbuf, _IO_file_setbuf, GLIBC_2_0); |
758 | compat_symbol (libc, _IO_old_file_sync, _IO_file_sync, GLIBC_2_0); |
759 | compat_symbol (libc, _IO_old_file_overflow, _IO_file_overflow, GLIBC_2_0); |
760 | compat_symbol (libc, _IO_old_file_seekoff, _IO_file_seekoff, GLIBC_2_0); |
761 | compat_symbol (libc, _IO_old_file_underflow, _IO_file_underflow, GLIBC_2_0); |
762 | compat_symbol (libc, _IO_old_file_write, _IO_file_write, GLIBC_2_0); |
763 | compat_symbol (libc, _IO_old_file_xsputn, _IO_file_xsputn, GLIBC_2_0); |
764 | |
765 | #endif |
766 | |